Hard to tell, but most likely it was Ricky Schroeder. We are about the same age and in the last couple of seasons of Silver Spoons there were a lot of shirtless scenes of him. There was also Billy Jacoby, one of the first "hunky" teen stars he had great abs and it seemed like none of the characters he played owned shirts. I especially liked him in "Just One Of The Boys" where he mostly just wore boxers and an open robe. Then of coarse there were the many, many boys on "You Can't Do That On Television", every episode had them either shirtless or running around in just their underwear. Quality family programing at it's best, lol...